A New and Expedient Diastereoselective Synthesis of α-(Hydroxyamino)phosphonates and α-Aminophosphonates by Silyl Triflate Promoted Diethyl Phosphite Addition to Chiral N-Benzyl Nitrones
作者:Carmela De Risi、Daniela Perrone、Alessandro Dondoni、Gian Piero Pollini、Valerio Bertolasi
DOI:10.1002/ejoc.200200698
日期:2003.5
efficient methodology for the synthesis of α-aminophosphonates has been developed taking advantage of the tert-butyldimethylsilyl triflate activated addition of diethylphosphite to N-benzylnitrones derived from chiral α-alkoxy and α-(Boc-amino) aldehydes. The stereoselective carbon− phosphorus bond-forming reaction proceeded smoothly to give α-(hydroxyamino)phosphonate intermediates as the primary
作者:A. Dondoni、S. Franco、F. Junquera、F. L. Merchán、P. Merino、T. Tejero
DOI:10.1080/00397919408010565
日期:1994.10
A general procedure for the synthesis of twenty-seven chiral and achiral N-benzyl nitrones 1 is described.
O -Silyl triflate-promoted addition of diethyl phosphite to chiral aldonitrones. A rapid access to complex α-amino phosphonates and their N -hydroxy derivatives
作者:Carmela De Risi、Alessandro Dondoni、Daniela Perrone、Gian Piero Pollini
DOI:10.1016/s0040-4039(01)00363-x
日期:2001.4
The addition reaction of diethyl phosphite to O-silylated N-benzyl nitrones derived from chiral alpha -alkoxy and N-Boc alpha -amino aldehydes has been studied as a stereoselective carbon-phosphorus bond forming process for the synthesis of polyhydroxylated alpha -amino and alpha,beta -diamino phosphonates. Key intermediates are the corresponding N-hydroxy alpha -amino phosphonates. (C) 2001 Elsevier Science Ltd. All rights reserved.
Diastereoselective Hydrocyanation of Chiral Nitrones. Synthesis of Novel α-(Hydroxyamino) Nitriles
作者:P. Merino、A. Lanaspa、F. L. Merchan、T. Tejero
DOI:10.1021/jo961293a
日期:1996.1.1
Stereoselective grignard reactions to α-amino nitrones. Synthesis of optically active α-aminohydroxylamines and 1,2-diamines
作者:Pedro Merino、Ana Lanaspa、Francisco L. Merchan、Tomas Tejero
DOI:10.1016/s0957-4166(97)00250-4
日期:1997.7
α-Aminohydroxylamines are formed stereoselectively from the nucleophilic addition of phenylmagnesium bromide to α-amino nitrones. In contrast, the addition of methylmagnesium bromide occurs in a stereorandom fashion. Nevertheless it is possible to achieve a complete syn selectivity by diprotecting the α-amino group in the starting nitrone. Hydrogenation of the obtained α-amino hydroxylamines followed